[PATCH v2 1/5] winevulkan: Support prefixing function parameters.

[Zebediah Figura]

One possible optimization that Paul and I had discussed a while back was 
to allow for the possibility of "masked" or "uninterruptible" syscalls, 
that is, syscalls that cannot be directly interrupted with 
SuspendThread(). The idea is that instead of saving the whole 
nonvolatile context up front, you instead set a flag in the syscall 
dispatcher (when SIGUSR1 is received) that tells the restore path to 
save the whole context and break into the suspend handler.

This would only be usable for calls which don't sleep (or don't sleep 
for a meaningful amount of time), but as I understand that could include 
most Vulkan calls, including vkUpdateDescriptorSets and other important 
ones.